The selection and use of servo performance criteria

THE APPLICATION of performance criteria in the analysis, and more particularly in the synthesis, of servo systems is a matter of importance, but it is one of considerable difficulty as compared with the application of stability criteria. Although it is generally agreed that concise criteria of performance are desirable, there has been no general agreement as to what criteria should be used. This is not too surprising, for surely there should be many criteria to fit the various requirements of different servos.